This document discusses how infectious diseases transmit through aerosols and droplets, and strategies for controlling airborne transmission in indoor environments. It explains that aerosols can travel farther than droplets and be impacted by HVAC systems. Mathematical models are presented for airborne infection risk based on factors like exposure time and ventilation. Research needs are identified like determining if a virus transmits through aerosols, its natural decay rates, and exposure thresholds. Strategies discussed include increasing ventilation and filtration, controlling temperature and humidity, and using upper-room UVGI. Engineers can help identify vulnerabilities and approaches to interrupt air supply to shelter locations. More research is needed on virus transmission through aerosols.